Mr. Home

The rear offside indicator on my 1999 Renault Laguna mk1 1.6 petrol has failed to stop working. The bulb works perfect tested. The contacts are not rusty but, still does not work? The relay obviously works because when I turn right indicators flash normal. But, when turn left indicators flash fast. I turn on the hazard warning lights works normal. Rear offside indicator fails to work. Can't be the bulb, not blown the bulb holder contacts not rusty. Big problem i can't fathom out why not working The relay clicks the,amber light in centre console flashes when I turn it on. Very annoying indeed? Mot soon & obviously it'll fail. Please help